Only one shot required for me, 22 yrs ago with a 308. first shot kill ...but it's still a matter of some luck on a tiny target, at a mere 1000 yds. 69 shots is not impressive, at any range. Should be a 10 shot minimum with 2 hits, on target. Anyone can get lucky, but repeating the feat several times in a few shots shows precision equipment and skill....with a 2 man team max, and a limit on scientific equipment, just a spotter and a range finder, a even better, to accompany your favorite rifle. It's already satellites and electronic gadgets but soon artificial intelligence, and a robot to hold your gun...that doesn't use the inferior outdated bullet as aprojectiles.